Nelli Ohr was contracted by Christopher Steele of Fusion GPS to work on the dossier and may have used a ham radio to talk privately with Fusion GPS, as pointed out by "The Last Refuge:"
"The Clinton Campaign hired Fusion GPS in April 2016.
Fusion GPS then sub-contracted retired British Intel MI6 agent Christopher Steele.
Fusion GPS employee Nellie Ohr gets HAM radio license in May 2016...

Nonsense on the coincidence. More plausible Steele and Ohr knew any communication with foreign sources/actors could be easily monitored...

One way to ensure communications with parties external to the U.S. can be secure would be the use of HAM radio operations."

"One way to ensure communications with parties external to the U.S. can be secure would be the use of HAM radio operations"

Any use of encrypted communication on HAM bands is forbidden by FCC and you will get prosecuted by doing so not to mention that is highly impractical (propagation for example) and slow for any truly encrypted modes due to bandwidth constrains.